* Past participle: This is the most common usage, meaning that something has been felt or undergone. For example: "She is an experienced teacher."
* Adjective: This is also a common usage, describing someone or something that has a lot of knowledge or skill due to having done something for a long time. For example: "He has experienced many hardships."
It is NOT a participial gerund or infinitive.
* Participial gerund: This is a verb form ending in "-ing" that acts as a noun. Examples: "Running is good exercise."
* Infinitive: This is the base form of a verb usually preceded by "to." Examples: "To run is good for you."
In short, "experienced" is typically used as a past participle or adjective, not as a participial gerund or infinitive.